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Furthermore, when upgrading to ESXi 6.5, there is no in-place upgrade path of a VMFS-5 datastore to VMFS-6. Therefore, it is recommended to create a new volume entirely, format it was VMFS-6, and then Storage vMotion all virtual machines from the old VMFS-5 datastore to the new VMFS-6 datastore and then delete and remove the VMFS-5 datastore when complete.